Query Performance With DateTime Versus Int Condition

Jul 10, 2007

Good day,

The following query performs acceptably (2 seconds against 126,000,000 rows in the main table):

SELECT Count(*)

FROM

Message1_2_3 INNER JOIN

VDMVDO ON Message1_2_3.VDMVDO_ID = VDMVDO.VDMVDO_ID INNER JOIN

NMEA ON VDMVDO.NMEA_ID = NMEA.NMEA_ID

WHERE

NMEA.NMEA_ID BETWEEN 14000000 AND 14086000 AND

VDMVDO.RepeatIndicator = 0 AND

NMEA.SentenceFormatterID = 'VDM'

When we change the first condition from an Int column to a DateTime as in:

NMEA.TimeDate BETWEEN CONVERT(DATETIME, '2007-07-09 8:30:00', 102) AND CONVERT(DATETIME, '2007-07-09 9:30:00', 102)

the query performance falls to 14 seconds, even though both columns are indexed and a similar number of rows are found. When the select clause changes from a simple Count to a complex Max expression, response time falls to over a minute!

Any thoughs on optimizing the DateTime search would be greatly appreciated...

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May 15, 2008

I was hoping I wouldn't be another poster with performance issues after migrating to SQl 2005 from SQL 2000 but here I am.

I am in the process of testing out our databases on Sql Server 2005 for migration from SQL Server 2000 and there are certain portions of code that have been affected negatively. I have read thru many of the posts here and have tried out most of the recommendations. I will start out with things I've done and then provide the actual SQL.

1) I have rebuilt all indexes ( using the DBCC REINDEX using the table option).
2) Updated the db engine to latest hot fix (build 3239) that addresses speed related fixes.
3) I also ran sp_createstats using the 'fullscan' option to create stats on all columns of all tables (minus indexed columns)
4) Since nothing seemed to work, I even ran UPDATE STATICS with FULL SCAN on all tables even though I did not need it as the REBUILD woudl have created stats. But I was willing to try anything.

I have confirmed that the execution plans are different even though the data on both sql 2000 and sql 2005 are identical (i put a copy on 2005). The plans themselves are huge as the queries are huge. Here is the query.

SELECT InterimView.* ,TestView.*

FROM View_LabDataExport_TestFormData_55 TestView
RIGHT OUTER JOIN ( SELECT ReqView.*, CDView.*
FROM View_LabDataExport_FormData_55 ReqView
LEFT OUTER JOIN View_LabDataExport_FormData_CD_55 CDView
ON ( CDView.DB_SubjectID_CD = ReqView.DB_SUbjectID )

) InterimView

ON ( InterimView.DB_FormID = TestView.DB_FormID_T AND

InterimView.DB_LabSampleID = TestView.DB_LabSampleID_T )

The above query takes abotu 8 secs to run on 2000 and about 1 minute to run on 2005. This is for a small dataset and on larger datasets this is only going to more pronounced ( as confirmed by other teams that have already migrated in my company). Another point worth mentioning might be if I remove the TestView.* from the select list, it works in 5 to 6 seconds. Is there an issue with Sql 2005 and a large number of columns or anything of that sort? On 2000, the time remains the same , about 8 seconds if I remove this from the select list.

Here is the statistics ion on 2005

(21234 row(s) affected)

Table 'Worktable'. Scan count 75490, logical reads 3676867, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'LabTestToReportPanel'. Scan count 476, logical reads 1524, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'LabReportPanel'. Scan count 0, logical reads 260, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'DiscreteValue'. Scan count 1, logical reads 176106, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'LabReleasedSampleTest'. Scan count 1, logical reads 2078, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'LabSample'. Scan count 1360, logical reads 18567, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'Form'. Scan count 2302, logical reads 8225, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'LabTest'. Scan count 1, logical reads 23, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'LabSampleDef'. Scan count 1, logical reads 10530, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'LabArea'. Scan count 1, logical reads 2, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'Lab'. Scan count 1, logical reads 2, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'Location'. Scan count 1, logical reads 2, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'Study'. Scan count 0, logical reads 6, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'Item'. Scan count 1335, logical reads 32940, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'ObjectState'. Scan count 1, logical reads 10972, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'Object'. Scan count 0, logical reads 20674, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'Subject'. Scan count 0, logical reads 3293, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'FormDef'. Scan count 2, logical reads 70, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'PrintedLabSampleLabel'. Scan count 0, logical reads 13144, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'PrintedForm'. Scan count 0, logical reads 4219, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'StudySite'. Scan count 0, logical reads 2756, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'StudyEvent'. Scan count 18, logical reads 40, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'StudyEventDef'. Scan count 0, logical reads 36, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'FormDefToStudyEventDef'. Scan count 1, logical reads 43, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Table 'LabSampleDefToFormDef'. Scan count 1, logical reads 255, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

Here is the statistics ion on 2000

Table 'LabTestToReportPanel'. Scan count 2123, logical reads 4820, physical reads 44, read-ahead reads 0.

Table 'LabReportPanel'. Scan count 130, logical reads 260, physical reads 0, read-ahead reads 0.

Table 'DiscreteValue'. Scan count 103914, logical reads 208214, physical reads 0, read-ahead reads 0.

Table 'Location'. Scan count 19031, logical reads 38062, physical reads 2, read-ahead reads 0.

Table 'Lab'. Scan count 19031, logical reads 38062, physical reads 0, read-ahead reads 0.

Table 'LabArea'. Scan count 19031, logical reads 38062, physical reads 0, read-ahead reads 0.

Table 'LabSampleDef'. Scan count 24670, logical reads 49340, physical reads 0, read-ahead reads 0.

Table 'LabTest'. Scan count 19406, logical reads 39575, physical reads 0, read-ahead reads 0.

Table 'LabReleasedSampleTest'. Scan count 4289, logical reads 73865, physical reads 1014, read-ahead reads 24.

Table 'Study'. Scan count 4291, logical reads 8582, physical reads 0, read-ahead reads 0.

Table 'LabSample'. Scan count 5647, logical reads 31382, physical reads 308, read-ahead reads 4.

Table 'Form'. Scan count 4291, logical reads 9272, physical reads 2, read-ahead reads 10.

Table 'PrintedLabSampleLabel'. Scan count 4289, logical reads 17097, physical reads 114, read-ahead reads 308.

Table 'ObjectState'. Scan count 6860, logical reads 13760, physical reads 1, read-ahead reads 0.

Table 'Object'. Scan count 6860, logical reads 23559, physical reads 90, read-ahead reads 701.

Table 'PrintedForm'. Scan count 1375, logical reads 4505, physical reads 40, read-ahead reads 16.

Table 'StudySite'. Scan count 1378, logical reads 2756, physical reads 4, read-ahead reads 0.

Table 'Subject'. Scan count 1599, logical reads 3332, physical reads 2, read-ahead reads 0.

Table 'StudyEvent'. Scan count 18, logical reads 52, physical reads 0, read-ahead reads 0.

Table 'StudyEventDef'. Scan count 18, logical reads 54, physical reads 0, read-ahead reads 2.

Table 'FormDefToStudyEventDef'. Scan count 1, logical reads 69, physical reads 0, read-ahead reads 23.

Table 'FormDef'. Scan count 2, logical reads 78, physical reads 1, read-ahead reads 4.

Table 'LabSampleDefToFormDef'. Scan count 1, logical reads 308, physical reads 1, read-ahead reads 306.

Table 'Item'. Scan count 1335, logical reads 36510, physical reads 140, read-ahead reads 1047.

(21234 row(s) affected)

(147 row(s) affected)

One difference between the two is the work table that 2005 creates versus 2000. I can attach the plans but they are huge. I will attach it if you ask.

What I was looking for was suggestions on what I could do short of rewriting code or any suggestions in general.

FYI, this has also been posted on the SQL Server Engine forum.

Thanks

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t.Address1,t.Address2,t.City,t.State,t.Country,t.Zipcode, t.Phone,sum(t.totalquantity) as Totalquantity,

t.Audience_type

from

(

select distinct

v.sopnumbe, v.campaign, v.custnmbr, v.custname, v.address1, v.address2,v.city,v.state,v.country,v.zipcode,

v.Phone, v.totalquantity as totalquantity,

case @audience_type

when v.custclas then v.custclas

end as audience_type
from vwstzipcustaudienceinfo v

Where (v.itemnmbr = '' or v.itemnmbr=v.itemnmbr) and v.Campaign = @Campaign and (v.docdate between @startdate and @enddate)

) as t

where t.audience_type is not null

group by t.campaign,t.Sopnumbe,t.Custnmbr,t.Custname,

t.Address1,t.Address2,t.City,t.State,t.Country,t.Zipcode, t.Phone, t.Audience_type

)

--select * from mystatezipcustaudienceinfo('cpd','1/1/2008','5/15/2008','INDPATIENT') --getting 500rows

--select * from mystatezipcustaudienceinfo('Cpd'','1/1/2008','5/15/2008','INST-HOSPITAL') -- note getting single row

problem have a “-“ in them..i m not getting result..so what condition should be in red color one..

thanks

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How I have to implement this dynamic query in the below mentioned code.I have add the dynamic query where i have mentioned as '---- Where clause has to be added '. Sometime the table input will be having all the value for search. How I can implement this in my query with good performance.

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[Code] ....

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Hi,
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-----------------------------------------------
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300 300 P parent_Y
etc................

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Hi all,

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First I have to apologize about posting the problem here , since it not actually relate to SQL Server

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2 102013 1000
1 112013 1000
1 112013 1000
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[Code] ....

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